Hi, I tend to drink a lot of caffeine with work and am generally stressed. I m in good health other than some middle ear issues. Occasionally and starting within the last year, I get lightheaded with a bizzare taste in my mouth and something strange with my lips . Maybe they go numb, and I feel like I m drooling/producing excess saliva , but I don t think I am. It passes after about 45 seconds. Thank you!!